Differences in growth between offspring of anadromous and freshwater brown trout Salmo trutta
Peer reviewed, Journal article
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Date
2021Metadata
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Original version
10.1111/jfb.14693Abstract
In this study, individual growth of juvenile offspring of anadromous and freshwater
resident brown trout Salmo trutta and crosses between the two from the River Imsa,
Norway, was estimated. The juveniles were incubated until hatching at two temperatures
(±S.D.), either 4.4 ± 1.5 C or 7.1 ± 0.6 C. Growth rate was estimated for 22 days
in August–September when the fish on average were c. 8 g in wet mass, and the estimates
were standardized to 1 g fish dry mass. Offspring of anadromous S. trutta grew
better at both 15 and 18 C than offspring of freshwater resident S. trutta or offspring
of crosses between the two S. trutta types. This difference appears not to result from
a maternal effect because anadromous S. trutta grew better than the hybrids with
anadromous mothers. Instead, this appears to be an inherited difference between the
anadromous and the freshwater resident fish lending support to the hypothesis that
anadromous and freshwater resident S. trutta in this river differ in genetic expression.
Egg incubation temperature of S. trutta appeared not to influence the later growth as
reported earlier from the studies of Atlantic salmon Salmo salar.